GAF product renderingAsphalt Shingle Systems
Asphalt Shingle Roof Replacement —
Built as a Complete System
Architectural and designer asphalt shingle systems from GAF, installed to manufacturer spec. Westmark includes the GAF Golden Pledge — lifetime coverage on material defects, labor, and workmanship across all qualifying GAF system components — on every qualifying asphalt installation.
Get an instant budget estimate in about 60 seconds using aerial roof data — no appointment or sales call required.
Why Asphalt
Why Asphalt Is Still the Dominant Roofing Choice
Asphalt shingles cover the majority of single-family roofs in North America for a reason — proven performance, strong warranties, and excellent value when installed as a complete system.
Proven Track Record
Decades of field performance across every climate in North America.
Excellent Value
Lower upfront cost than premium synthetic or tile, with strong long-term performance when installed correctly.
Class A Fire Rated
Qualifying GAF asphalt systems carry a Class A fire rating — the highest available — when installed as a complete system.
Golden Pledge Included
Every qualifying Westmark GAF asphalt install includes the GAF Golden Pledge — lifetime material, labor & workmanship.
Curb Appeal Options
Architectural and designer profiles available — not just basic 3-tab.
Repair-Friendly
If localized damage ever occurs, individual sections can be addressed without redoing the whole roof.
Fast Installation
Most asphalt replacements complete in 1–3 days — minimizing disruption to your home.
GAF System Framing
We Install Complete GAF Systems — Not Just Shingles
A GAF system pairs the field shingle with manufacturer-matched underlayment, leak barriers, starter strip, ridge caps, and ventilation — all installed to GAF manufacturer specification. It's also what unlocks GAF's Advanced Protection Technology™ — including GAF Dura Grip™ Advanced Sealant, plus LayerLock™ technology and GAF WindProven™ wind coverage on qualifying Timberline HDZ systems.
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GAF Underlayment
Modern synthetic underlayment built for sustained UV and heat exposure.
Leak Barriers
GAF WeatherWatch ice & water shield at valleys, eaves, and penetrations.
Starter Strip
GAF Pro-Start starter for a sealed, wind-resistant first course.
Field Shingle
GAF Timberline HDZ or Grand Sequoia depending on the system tier — Timberline HDZ-RS and Grand Sequoia RS available where California Title-24 applies.
Ridge & Hip Caps
Matching GAF ridge caps for a finished, manufacturer-aligned roof line.
Cobra Ventilation
GAF Cobra ridge vent paired with proper intake — balanced ventilation, not optional.
6 Nails, Never Staples
Every shingle is hand-nailed with 6 nails — never staples and never the industry-standard 4 — exactly as the GAF Golden Pledge requires.
Explore the System
The Parts of a GAF Roofing System
Every layer plays a role. Click through each part of the roof below to see the GAF components we install — from leak barriers and starter strip to ridge caps and attic ventilation.
Ready to price out an asphalt shingle replacement?
Start with the instant estimate. We'll follow up with a precise written quote — broken down by system tier so you can compare side-by-side.
Built-In Protection
Two More Protections Built Into Every GAF Roof
Beyond the Golden Pledge, a complete GAF system built with Timberline shingles qualifies for two additional manufacturer protections — at no extra cost.
WindProven™ — No Wind Speed Limit
Timberline shingles with LayerLock Technology, installed with four GAF accessories, are eligible for the GAF WindProven Limited Wind Warranty — the industry's first wind warranty with no maximum wind speed limit and no named-storm exclusion. A 15-year limited wind warranty, included at no extra cost. Real protection for Santa Ana season. Eligibility and terms are defined by GAF's WindProven Limited Wind Warranty.
StainGuard Plus™ — Algae Protection
Those black streaks on older roofs are blue-green algae. Timberline HDZ shingles are built with GAF Time-Release Algae-Fighting Technology and carry a 25-year StainGuard Plus Limited Warranty against blue-green algae discoloration — helping keep your roof looking new for years. Coverage terms are defined by the GAF Shingle & Accessory Limited Warranty.
Good vs Better
GAF Timberline HDZ vs GAF Grand Sequoia
Both are complete GAF systems. Both include the GAF Golden Pledge. The difference is profile, dimensionality, curb appeal, and price point — not whether one is a 'real warranty' roof.
GAF Timberline HDZ — Strongest Value
Architectural profile. The most-installed shingle in North America. LayerLock wind resistance. Complete GAF system. GAF Golden Pledge included. Class A fire rated.
GAF Grand Sequoia — Upgraded Curb Appeal
Designer dimensional profile that mimics cedar shake. Thicker, richer visual presence. Complete GAF system. GAF Golden Pledge included. Class A fire rated.
Why It Lasts
Curb Appeal, Durability, and Warranty
Real-world performance comes down to three things — and we build for all three on every project.
Curb Appeal
Architectural and designer profiles add depth and dimension that flat 3-tab can't match.
Durability
Modern synthetic underlayment, leak barriers, and balanced ventilation are what determine real-world lifespan — not just the shingle.
Warranty
Complete GAF systems installed to GAF manufacturer specification are eligible for the GAF Golden Pledge — Lifetime limited manufacturing-defect and workmanship coverage, including 50-year non-prorated manufacturing-defect protection and 25- or 30-year non-prorated workmanship protection, depending on the shingle selected.
FAQs
Common Questions
Get Your Asphalt Shingle Roof Quote.
Instant estimate in 60 seconds, then a precise written quote — no high-pressure sales call.
Get an instant budget estimate in about 60 seconds using aerial roof data — no appointment or sales call required.